Hydraulic riveting and bending machine



Oct. 21,1931. F. J. MYERS 1,828,874

HYDRAULIC RIVETING AND SENDING MACHINE Filed July 11. 1929 3 Sheets-Sheet 1 FIG. 2. INVENTOR.

' FREDERICK .1. MYE'RS A TTORNEYS.

Oct. '27, 1931. F. J. MYERS 1,323,874

HYDRAULIC RIVETING AND BENDING MACHINE Filed July 1. 1929- 3 Sheets-Sheet 2 29 ZglG. '9.

IN V EN TOR.

FREDERICK J. MYERS A TTORNEYS.

Oct. 27, 1931. F J? E S 1,828,874

HYDRAULIC RIVETING AND BENDING MACHINE Filed July 1. 1929 s Sheets-Sheet 5 FIG. 5.

JNVENTOR. FREDERICK J. MYERS A TTORNEYS.

was 0a. 21, 1931 Qumran s'r Tss PATENT- OFFICE J. OI KANSAS CITY, ,muumc RIVE'I'III'G AND IAOHDTE Application fled July 1,

The invention relates to-an improved hydraulic press for driving rivets'by pressure .and for bending bars and plates of metal, a

machine for this class of work being commonly known as a bulldozer, and when em- 1 pressure, or to bend metal bars, metal plates and the like with a hydraulic press, but it has 'not been found practical heretofore to employ air and liquid such as oil on opposite sides of the same plunger or piston, owing to the leakage of the air. over the piston or plunger into the oil, which prevents the working ram from returning to the starting point after making a working stroke.

It is very advantageous in riveting machines and bulldozers to be able to employ compressed air to drive a piston in one direction and a-liquid as oil under pressure to drive the piston. in the opposite direction, as

will be seen from the details hereinafter set forth. I

The present invention has provided an improved hydraulic press which is advantageously employed as a riveting machine for driving and setting rivets by pressure and as a' bulldozer for metal bars, plates and the like, with the piston that operates the working ram and the piston operating against fluid as oil to create pressure, both so constructed that compressed air is employed on one side of each piston to force it -.in one direction and oil on the opposite side struction, combinations and arrangementsof' parts hereinafter set forth and more particularly pointed out in the appended claim, the

accompanying drawings illustrating a form.

of the invention that has been constructed and is driving and setting rivets and bending bars and plates of metal'perfectly.

.Ineh s==-- 1989. Serial 30. 875,178.

Fig. 1 isa plan view of the improved machlne.

Fig. 2 is a view in side elevation.

Fig. 3 is a view in end elevation.

Fig. 4 is a view in elevation of the end op ositeto that of Fig. 3.

ig. 5 is an enlarged sectional view on line 5-5 of Fi 1.

Figs. 6, 8 and 9 are still further enlarged.

Figs. 6 and 7 are side and end elevations res ctigely of one of the pistons illustrated in 1g.

Fig. 8 is a sectional view on line 8-8 of Fig; 9 is a sectional view on line 9-9 of he work table 1 is preferably of plate steel and is secured to the channel shaped frame members 2 by the rivets 3,.v the. supporting legs 4 being secured to the frame members by the rivets 5.

The cylinder 6 is provided with the integral lug? 7 by which the cylinder is secured tot e frame members 2 with the bolts 8. One end of the cylinder 6 is closed by the cylinderhead 9 which is secured to the cylinder by the bolts 10, while the opposite end of the cylinder is clowd by the cylinder head 11 secured thereto bl lfrojecting from t e cylinder head 11 an as shown integral therewith is the hydraulic ressure generating cylinder 13 which is. ormedw1th the upwardly disposed branch pipe 14 terminating in the flange 15.

ecured to the table 1 by the rivets 16 is the bolts 12. .7

the hydraulic ram cylinder 17 which is pro- 5}- v'ided with the downwardly disposed branch pi 18'terminating in theflange 19. I

he flanges 15 and 19, are companion flanges and are separated only by theagasket 20, the "bolts 21 securing them rigi y together and making them tight against leakage of fluid under high pressure within the p1 es and'the cylinders 13 and 17. i,

ithin the cglinder 6 is the reciprocating piston 22 whic ,can be driven from end to end of the cylinder by compressed airand tight against perceptible leakage by the piston in either direction.

Secured rigidly in the piston is the tu the bularpiston rod 23 which projects within h draulic generating cylinder 13, 1s shouldi ered at 24 and slightl .reduced in .diameter, and has the stud It 25 secured ti htly within the projecting end thereof.

itting the reduced diameter of the tubular piston rod 23 formed by the shoulder 24 and bearing against the shoulder and held rigidly by the nut 26- is the hydraulic piston for generating pressure, comprisindg the duplicate ring shaped collars 27, the u licate packing1 cups 28- preferably of leat er and the pac ng cup separator 29.

The packing cup separator 29 is circular in shape and providedwith the external annular groove 30, the internal annular groove 31, the annular flanges 32 to bear against the ring shaped collars 27 so that any shrlnkage of the packing cups 28 'will not permit the separator 29 to move to and fro on the tubular piston rod 23, and is perforated with the radially disposed holes 33.

The tubular iston rod 23 is perforated with the radially disposed holes 34 which communicate through the internal annular groove 31 and holes 33 to the external annular groove 30 so that any leakage of fluid as oil or compressed air over either of the packing cups 28 will pass to the external groove 30 and through the holes 33 to the internal groove 31 and through the holes 34 to the interior or the tubular piston rod 23.

Telescoping into the tubular piston rod 23 sufliciently tight to prevent perce tible leakage is the escape tube 35 whic projects through the cylinder head 9 and is secured thereto bythe ordinary pipe bushing 36.

It will be understood from the foregoing that compressed air and the like when admitted to the cylinder 6 between the piston 22 and the cylinder head 9,, in the event it leaks over the escape tube 35to the interior of the piston rod 23 will pass out through the escape tube 35 to the atmosphere; and any air admitted between the piston 6 and the cylinder head 11 and into thepressure cylinder 13 which may leak over the adjacent packing cup 28 will escape through the piston rod 23 and escape tube 35 to the atmosphere, and should oil leak over the packing cu 28 adjacent the nut 26 it will escape in t e same manner.

Within the hydraulic ram cylinder 17 and projecting therefrom is the rod shaped ram 37 working through the packing 38 and packing nut 39, the inner end of the ram being reduced in diameter forming the shoulder 24A and has the stud bolt 25A screwed tightly within the inner end thereof.

Mounted on the reduced diameter of the ram 37 formed by the shoulder 24A and held the piston bein a duplication on a lar er scale of the hy raulic pressure piston which comprises the collars-27, packing cups 28 and se arator 29.

he ram 37is provided with the longitudinally dis osed hole 40,-the radially disposed holes in icated at 41 and communicating with the hole 4(l,. and through the packing cup separtor 29A, and the radially disposed holes 42 forming an exit for any oil and compressed air and the like that may leak over either of the packing cu s 28A.

Secured to the table 1 by t e bolts 43 passing through the slots 44 and adjustable along the slots, is the work rest 45.

The ordinary four way cook 46 is located adjacent the cylinder 6 and has connected therewith the compressed air supply pipe 47, the pipe 48 employed for compressed air exhaust, the pipe 49 leading to an communicating through the cylinder head 9, the pipe 50 leadin to and communicating through the cylinder cad 11 and the branch pipe 51 leading from the pipe 50 to the hydraulic ram cy inder 17 and communicating to the interior thereof between the hydraulic ram piston comprising collars 27A, packing cups 28A and the packing cup separator 29A, and the packing 38, the pipe 51 always being subject to air pressure or open to exhaust simultaneousl with the pipe 50.

T e four way cook 46 is operated by the handle 52 audit will be understood that all pipes leading from the cock may be closed, and that when the ipe 49 is opened to admit compressed air to t e cylinder 6 through the cylinder head 9, the

der head 11, and as air is admitted through i the pipe 50 the pipe 49 is open to exhaust. The hole 53is provided to fill the branch pipes 14 and 18 and so much as is necessary of c linders 13 and 17, and the screw plug 54 c oses the hole when the machine is in operation.

The radially disposed hole 55 is for the attachment of working tools which are of common and well known form and construction. From the foregoing it will be understood that with the supply pipe 47 supplied with compressed air the handle 52 of the four way cook 46 may be manipulated and the piston 22 reciprocated from end to end of the cylinder 6, and that the hydraulic pressure piston comprising rings 27, packing cups 28 and packing cup separator 29 will follow the movement of and move with the piston 22.

When the piston 22 is in the position shown in Fig. 5 the ram 37 is extended as shown in the same figure and when the piston 22'is in the opposite end of the cylinder 6'the ram 37,

is withdrawn into the cylinder 13 as shown in Fig. 1, as the piston 22 is moved from the position shown in-Fig. 5 to the opposite end of the cylinder 6 the comprewed airfrom I 1,ase,a74

the pip150 fills the pipe 51 alfil g: ace in g c ram the cy der 13 between the piston 27A, 28A and 29A, and t e packing 38 and forces and retains the ram piston aga nst the oilcontained between the two hydraulic pistons. a

Any compressed air that may leak over the packing cup 27 adjacent the cylinder 6 will -pass out through the tubular piston rod'23 packing cup '27A adjacent t e packing grooves; in com and escape tube 35 to the atmosphere, and should any oil leak over the companion packing cup 27- it will pass out with the air.

Any compressed air that ma leak over H518: will pass out through the hole 40 and hole 41' to the atmosphere, and should an oil leak over the companion packing cup A it will pass out with the air.

The present disclosure illustrates and describes a hydraulic press that has operated perfectly for several weeks with a sin 1e replenishing of the oil between the hy aulic pistons.

What I claim as new, and desire to secure by Letters Patent, is

In a hydraulic riveting and bending machine, a main cylinder with a piston therein operated by compressed air, a closin cylinder head on one end of said cylin r, the opposite end of said cylinder closed by a cylinder head provided with an elongated hub forming a hydraulic intensifying pressure cylinder opening into said main cylinder, a piston in said ressure cylinder presenting the cup ed si e of a hydraulic packing cup in can direction of the length of said cylinders, a ring between said packing cups provided with an external annular groove and an internal annular groove and a radially dis osed hole connecting said gination with a hollow piston rod connecting said pistons and provided with a hole connecting with said internal annular groove, and a tube secured in said closing cylinder head and telescoping into said piston rod and forming communication from said annular grooves to the exterior of said cylinders.

FREDERICK. J. MYERS. 

